The Ethereal Queen is the "final boss" in Radiata Stories, found at the end of the bonus dungeon. She is also one of two gods worshipped by the Olacion Order and can be seen along with Gabriel Celesta on both the Temple face and in Anastasia Ryan's volty attack. Other than that, not much is known about the Ethereal Queen other than that she seems to be a signature last boss in Tri-Ace games.